Find the product of `-5x^2y ,-2/3x y^2z ,8/(15)x y z^2a n d-1/4zdot` Verify the result when `x=1, y=2\ a n d\ z=3.`

Explanation

To find the product of the given expressions \(-5x^2y\), \(-\frac{2}{3}xy^2z\), \(\frac{8}{15}xyz^2a\), and \(-\frac{1}{4}z\), we will follow these steps:

### Step 1: Write down the expressions
We have:
1. \(-5x^2y\)
2. \(-\frac{2}{3}xy^2z\)
3. \(\frac{8}{15}xyz^2a\)
4. \(-\frac{1}{4}z\)
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